Portion of a bottom surface of a shoe outsole



FIG. 1 is a perspective view of a portion of a bottom surface of a shoe outsole showing my new design; and,

FIG. 2 is a bottom plan view of the portion of a bottom surface of a shoe outside shown in FIG. 1.

The broken line showing of the remainder of the shoe outsole is for illustration purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a bottom surface of a shoe outsole, as shown and described. 